.MainToolbarPanel{
    position: absolute;
    margin-left: auto;
    margin-right: auto;
    left:0px;
    right:0px;
    top:29px;
    width: 900px;
    height: 32px;
    padding-left: 8px;
    padding-right: 8px;
    background: rgba(0,0,0,0.50);
    border-radius: 4px;
    color: white;

}

.arrow-up {
margin-left:10px;
width: 0; 
height: 0; 
border-left: 5px solid transparent;
border-right: 5px solid transparent;
border-bottom: 5px solid black;
}
  